Refs have had some shocking criticisms recently and it has become more of a "bias" issue, rather than "just being shite" issue and in that respect he has some right on his side.
But he should just fuck off and be quiet as he has no credibility. I don't reckon he was biased either, just stupid.
But Celtic have thier own agendas, especially when they are playing as erratically as they are and have a manager who is rapidly beginning to lose his initial veneer of calm, he's turning into the snarling cunt he was on the pitch.
It as long been said that a ref having a good game is largely anonymous, it seems the refs are keen to shed this and have more of the focus given McDonald's "position of strength" remark. That would not be a good thing.
Equally, any respect for the game has to begin with the managers, players and clubs. If players are to be continually lauded by managers and fans for outright cheating and trying to hoodwink refs, what fucking chance have the refs got? The managers hammer refs for getting decisions wrong but players conning refs into making the decisions are immune to that hammering. The system and the way clubs and managers and players conduct themselves in it is skewed against the refs however good bad indifferent or awful or biased or bigotted they are.